Library /sys$common/syshlp/DECSET$ENVMGR.HLB  —  cgui  lndlg PopForm, lnentdeas Btn
    Push the Enter Deassign button to enter a deassign logical name specified
    in the logical name field to the Logical Names/Equivalence
    Strings list. The contents of the Equivalence string field are
    ignored.
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